Adhisive is no good, just screw the entire board, back boarding is also not a good idea if you have down lighters, they will not clip in double layered board
@@justinbaxter9909 share half a joist one plasterboard goes on half the joist.. the other plasterboard flush on the other side of the joist don’t overhang a board always end on joist
@RAGAS you can use the standard plasterboard (white or gray couleur) in toilette , the waterproof board (green)are for a shower and good for a humid rooms
